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JEE Main & Advanced Physics Wave Mechanics Question Bank Basics of Mechanical Waves

  • question_answer
    A stone is dropped in a well which is 19.6m deep. Echo sound is heard after 2.06 sec (after dropping) then the velocity of sound is                                                                       [RPMT 1999]

    A)            332.6 m/sec                          

    B)            326.7 m/sec

    C)            300.4 m/sec                          

    D)            290.5 m/sec

    Correct Answer: B

    Solution :

               \[t=\sqrt{\frac{2h}{g}}+\frac{h}{v}=\sqrt{\frac{2\times 19.6}{9.8}}+\frac{19.6}{v}=2.06\]                    \[\Rightarrow \] \[v=326.7\]\[m/s\]


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